The SEMI Standards PV Silicon Materials Task Force was established in 2009 to develop a standardized specification for solar grade feedstock materials, which will allow manufacturers to produce consistent silicon solar cells. The specification received input from major polysilicon suppliers through three rounds of balloting and was published in June 2011. By using this specification, polysilicon and cell manufacturers can specify chemical (donor concentration), dimensional (chunk, rod, bricks), and packaging characteristics on their purchase order for feedstock materials.